.NET: Add AIClient HTTP Traffic Tracing sample with logging capabilities

dotnet/agent-framework-dotnet.slnx

@@ -171,6 +171,7 @@
   </Folder>
   <Folder Name="/Samples/GettingStarted/Observability/">
     <Project Path="samples/GettingStarted/AgentOpenTelemetry/AgentOpenTelemetry.csproj" />
+    <Project Path="samples/GettingStarted/Observability/AIClientHttpTrafficTracing/AIClientHttpTrafficTracing.csproj" Id="cb65e098-6154-4996-aa53-faae2ee93842" />
   </Folder>
   <Folder Name="/Samples/GettingStarted/Workflows/">
     <File Path="samples/GettingStarted/Workflows/README.md" />

dotnet/samples/GettingStarted/Observability/AIClientHttpTrafficTracing/AIClientHttpTrafficTracing.csproj

@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Azure.AI.OpenAI" />
+    <PackageReference Include="Azure.Identity" />
+    <PackageReference Include="Microsoft.Extensions.AI.OpenAI" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.OpenAI\Microsoft.Agents.AI.OpenAI.csproj" />
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI\Microsoft.Agents.AI.csproj" />
+  </ItemGroup>
+
+</Project>

dotnet/samples/GettingStarted/Observability/AIClientHttpTrafficTracing/Program.cs

@@ -0,0 +1,75 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.ClientModel.Primitives;
+using Azure.AI.OpenAI;
+using Azure.Identity;
+using Microsoft.Extensions.AI;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+
+var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT environment variable is not set.");
+var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";
+
+var services = new ServiceCollection();
+services.AddLogging(loggingBuilder =>
+{
+    loggingBuilder.AddConsole();
+    loggingBuilder.AddFilter("System.ClientModel.Primitives.MessageLoggingPolicy", LogLevel.Debug);  // For Request and Response body logging we need to set Debug level
+    /* If uses in ASP.NET Core, with appsettings then this can be configured in appsettings.json as:
+    {
+      "Logging": {
+        "LogLevel": {
+          "Default": "Information",
+          "Microsoft.AspNetCore": "Warning"
+          "System.ClientModel.Primitives.MessageLoggingPolicy"": "Debug"
+        }
+      }
+    }
+     */
+});
+
+services.AddChatClient(provider =>
+{
+    var clientLoggingOptions = new ClientLoggingOptions
+    {
+        EnableLogging = true, // Enable logging overall
+        EnableMessageContentLogging = true, // Enable request and response body logging
+        MessageContentSizeLimit = 5000, // Limit size of logged content. If Null or Not set, then default value will be 4 * 1024 characters
+        EnableMessageLogging = true, // Logging the Request and Response Url and Header information. If Null or Not set, then default value will be true
+        LoggerFactory = provider.GetRequiredService<ILoggerFactory>()
+    };
+    clientLoggingOptions.AllowedHeaderNames.Add("Authorization"); // Logging sensitive header information, by default values will be REDACTED
+
+    /* Switch to OpenAI Compatible SDK using below code
+    var clientOptions = new OpenAIClientOptions()
+    {
+        Endpoint = new Uri("https://endpoint"),
+        ClientLoggingOptions = clientLoggingOptions
+    };
+    new OpenAIClient(new ApiKeyCredential("<apiKey/accessKey>"), clientOptions)
+    .GetChatClient("modelName")
+    .AsIChatClient();
+    */
+
+    return new AzureOpenAIClient(new Uri(endpoint), new AzureCliCredential(), new AzureOpenAIClientOptions() // Use OpenAIClientOptions of OpenAIClient, similar options for other clients
+    {
+        ClientLoggingOptions = clientLoggingOptions
+    })
+    .GetChatClient(deploymentName)
+    .AsIChatClient();
+});
+
+var serviceProvider = services.BuildServiceProvider();
+
+var chatClient = serviceProvider.GetRequiredService<IChatClient>();
+var pirateAssistant = chatClient.CreateAIAgent("You are a pirate assistant. Answer questions in short pirate speak.");
+
+var userInput = "Who are you?";
+Console.WriteLine($"You: {userInput}\n");
+var response = await pirateAssistant.RunAsync(userInput);
+Console.WriteLine($"\nPirate Assistant: {response}");
+
+/*await foreach (var item in pirateAssistant.RunStreamingAsync(userInput)) // For Streaming responses (RunStreamingAsync), there will be multiple log entries
+{
+    Console.Write(item);
+}*/

dotnet/samples/GettingStarted/Observability/AIClientHttpTrafficTracing/README.md

@@ -0,0 +1,78 @@
+# AIClient HTTP Traffic Tracing
+
+This sample shows how to enable **HTTP request/response logging** for LLM calls (including request/response bodies) for any `AIClient`.
+
+It uses the `ClientLoggingOptions` pipeline to print HTTP details to the `ILogger` so you can troubleshoot prompts, headers, and responses.
+
+## Prerequisites
+
+- Azure CLI login (this sample uses `AzureCliCredential`):
+  - `az login`
+- Environment variables:
+  - `AZURE_OPENAI_ENDPOINT` (e.g. `https://{resource-name}.openai.azure.com/`)
+  - `AZURE_OPENAI_DEPLOYMENT_NAME` (optional; defaults to `gpt-4o-mini`)
+
+Switch to OpenAI Compatible SDK using below code
+```csharp
+var clientOptions = new OpenAIClientOptions()
+{
+    Endpoint = new Uri("https://endpoint"),
+    ClientLoggingOptions = clientLoggingOptions
+};
+new OpenAIClient(new ApiKeyCredential("<apiKey/accessKey>"), clientOptions)
+.GetChatClient("modelName")
+.AsIChatClient();
+```
+
+## Run
+
+From the repo root:
+
+```powershell
+cd samples\GettingStarted\Observability\AIClientHttpTrafficTracing
+dotnet run
+```
+
+## Enable HTTP traffic logging
+
+This sample enables logging in two places:
+
+1. **Enable HTTP logging on the client**
+
+In [Program.cs](Program.cs), the sample configures:
+
+- `ClientLoggingOptions.EnableLogging = true`
+- `ClientLoggingOptions.EnableMessageLogging = true` (URL + headers + query parameters)
+- `ClientLoggingOptions.EnableMessageContentLogging = true` (request/response bodies)
+- `ClientLoggingOptions.MessageContentSizeLimit` to cap how much body content is written
+
+`ClientLoggingOptions` is a common pattern across SDK clients that expose these options (for example, via a `ClientLoggingOptions` property on client options like `AzureOpenAIClientOptions`).
+
+2. **Raise the log level to `Debug` only if you want request/response bodies**
+
+URL/headers/query parameter logging (step 1) is normally available at `Information` level and step 2 is not needed.
+
+Request/response *body* logging is emitted at `Debug` level by the underlying message logging policy. The sample sets:
+
+- `System.ClientModel.Primitives.MessageLoggingPolicy` → `Debug`
+
+## Security notes
+
+- Logging bodies can include sensitive prompt/response data. Use only in dev/test.
+- Headers like `Authorization` are **redacted by default**. The sample shows how to allow logging a sensitive header via `clientLoggingOptions.AllowedHeaderNames.Add("Authorization")` — avoid doing this unless you really need it.
+
+## Using ASP.NET Core configuration
+
+If you’re using ASP.NET Core, you can set the log level in `appsettings.json` instead of calling `AddFilter`, for example:
+
+```json
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning",
+      "System.ClientModel.Primitives.MessageLoggingPolicy": "Debug"
+    }
+  }
+}
+```